KR102401274B1 - Method and terminal device for random access - Google Patents

Abstract

An embodiment of the present invention discloses a method and a terminal device for random access, the method comprising: transmitting, by the terminal device, a plurality of preambles to a network device in one random access process; and monitoring the random access response RAR of at least one preamble among the plurality of preambles within the access response RAR window. The method and the terminal device of the embodiment of the present invention are advantageous in improving the reliability of the preamble transmission and the probability of the network device responding to the preamble.

Description

Method and terminal device for random access

An embodiment of the present invention relates to the field of communication, and more particularly, to a method and a terminal device for random access.

In the existing Long Term Evolution (LTE) system, the random access process starts with non-contention-based access, in which the network device configures a dedicated random preamble in the terminal device to start access, and the terminal device requests the preamble to initiate access. can be divided into contention-based access, and regardless of whether the terminal device performs contention-based access or non-contention-based access, the reliability of preamble preamble transmission is not high at all.

In view of the above, embodiments of the present invention provide a method, a terminal device, and a network device for random access advantageous for improving the reliability of preamble transmission and the response probability of the network device to the preamble.

A first aspect provides a method for random access, the method comprising: a terminal device transmitting a plurality of preambles to a network device in one random access process, and the terminal device sending at least one random access response RAR window and monitoring the random access response RAR of at least one preamble among the plurality of preambles within.

The one-time random access procedure indicates that the terminal device continuously transmits a plurality of preambles to the network device, rather than transmitting the corresponding preamble again after the terminal device fails in random access to the previously transmitted preamble.

Since the terminal device transmits a plurality of preambles to the network device in one random access process, it is advantageous in improving the reliability of the preamble transmission and the response probability of the network device to the preamble.

The plurality of preambles may be preambles including completely different sequences or may be preambles including the same sequence. The plurality of preambles may be transmitted using different beams or may be transmitted using the same beam. In one possible embodiment, the at least one RAR window comprises a RAR window whose starting position in the time domain is located after transmission of the plurality of preambles, and wherein the terminal device determines that the Monitoring the random access response RAR of at least one preamble of the plurality of preambles includes monitoring the RAR of at least two preambles of the plurality of preambles within the one RAR window.

In one possible embodiment, the at least one RAR window comprises one RAR window whose starting position in the time domain is located after the first preamble transmission of the plurality of preambles and before the second preamble transmission of the plurality of preambles, and , the step of the terminal device monitoring the random access response RAR of at least one preamble among the plurality of preambles within the at least one random access response RAR window is performed by the terminal device in at least two of the plurality of preambles in the one RAR window. monitoring the RAR of preambles.

Optionally, the terminal device may configure one RAR window for the plurality of preambles, and the starting position in the time domain of the RAR window may be between any two preamble transmissions.

In one possible embodiment, the at least one RAR window comprises a plurality of RAR windows positioned after transmission of a preamble corresponding to a starting position in the time domain of each RAR window corresponding to the plurality of preambles one-to-one, and the corresponding The step of the terminal device monitoring the random access response RAR of at least one preamble among the plurality of preambles within the at least one random access response RAR window includes the terminal device monitoring the RAR corresponding to the preamble within each RAR window. includes steps.

Optionally, the terminal device may configure a combination of the three types of RAR windows in a plurality of preambles.

In one possible embodiment, the starting position in the time domain of the first RAR window in the plurality of RAR windows is located in the K-th subframe after the preamble transmission corresponding to the first RAR window, and K is an integer less than 3 .

Optionally, the length of the K subframes is 3 ms.

By shortening the time interval between the RAR window and the preamble transmission, the terminal device can monitor the corresponding RAR more quickly, which is advantageous for the terminal device to perform random access.

In one possible embodiment, the step of transmitting, by the terminal device, a plurality of preambles to the network device in the one-time random access process, includes the terminal device in the one-time random access process, wherein the PRACH resource is at least one physical random access channel PRACH resource in the corresponding network and transmitting the plurality of preambles to the device.

In one possible embodiment, the step of the terminal device transmitting the plurality of preambles to the corresponding network device through at least one physical random access channel PRACH resource in the one-time random access process comprises the terminal device performing one random access process. and transmitting the plurality of preambles to the corresponding network device through a plurality of PRACH resources corresponding to the plurality of preambles on a one-to-one basis.

Optionally, the network device may configure a plurality of PRACH resources in advance to transmit a plurality of preambles, configure one PRACH resource to transmit a plurality of preambles, and the terminal device may transmit a plurality of preambles by configuring a plurality of PRACH resources, and the terminal device may have a position in the corresponding one PRACH resource. can determine by itself to transmit the corresponding preamble using

In one possible embodiment, after the step of the terminal device monitoring the RAR of a first preamble of the plurality of preambles within the at least one RAR window, the method further comprises that the terminal device determines the RAR of the first preamble and transmitting a third message in the random access process to the corresponding network device according to the included uplink grant.

Optionally, the third message in the random access process may carry a Radio Resource Control (RRC) connection request, and may carry some control messages, even service data packets, and the like.

In one possible embodiment, the RAR of the first preamble is the RAR initially monitored by the corresponding terminal device within the at least one RAR window

In one possible embodiment, the random access process is a contention-based random access process, a non-contention-based random access process or a random access process for obtaining system information

A second aspect provides a method for random access, the method comprising: receiving, by a network device, a plurality of preambles transmitted by a terminal device in one random access process; and feeding back at least one random access response RAR corresponding to at least one of the preambles of .

In one possible embodiment, the step of feeding back, by the corresponding network device, at least one random access response RAR corresponding to at least one preamble among the plurality of preambles to the corresponding terminal device includes the step of the corresponding network device being the first of the plurality of preambles. After receiving the first preamble, feeding back the RAR corresponding to the first preamble to the corresponding terminal device, and after the corresponding network device receives a preamble other than the corresponding first preamble among the plurality of preambles, to the corresponding terminal device and not feeding back the RAR.

In one possible embodiment, the at least one RAR includes a plurality of RARs corresponding to the plurality of preambles on a one-to-one basis, and a corresponding network device corresponds to at least one preamble of the plurality of preambles in a corresponding terminal device. The step of feeding back one random access response RAR includes feeding back the RAR corresponding to the corresponding terminal device whenever the corresponding network device receives each preamble among the plurality of preambles.

In one possible embodiment, the step of feeding back, by the corresponding network device, at least one random access response RAR corresponding to at least one preamble among the plurality of preambles to the corresponding terminal device, the corresponding network device receiving the plurality of preambles and then feeding back the corresponding at least one RAR to the corresponding terminal device.

In one possible embodiment, after the corresponding network device receives the plurality of preambles, the step of feeding back at least one RAR corresponding to the at least one preamble to the corresponding terminal device includes: the corresponding network device receiving the plurality of preambles and feeding back the corresponding at least one RAR to the corresponding terminal device according to the strength of a signal for receiving the plurality of preambles or the order of receiving the plurality of preambles after receiving the .

In one possible embodiment, the at least one RAR comprises a plurality of RARs, and the plurality of RARs are carried by one media access control MAC data protocol unit PDU.

Optionally, the corresponding network device receives the plurality of corresponding preambles transmitted by the corresponding terminal device through at least one physical random access channel PRACH resource in one random access process.

In addition, the corresponding network device receives the plurality of preambles transmitted by the corresponding terminal device through a plurality of PRACH resources corresponding one-to-one to the plurality of preambles in one random access process.

A third aspect provides a terminal device for executing the method of the first aspect or any possible manner of the first aspect. Specifically, the terminal device includes a unit for executing the method of the first aspect or any possible implementation manner of the first aspect.

A fourth aspect provides a network device for executing the method of the second aspect or any possible manner of the second aspect. Specifically, the corresponding network device comprises a unit for executing the method of the second aspect or any possible implementation manner of the second aspect.

A fifth aspect provides a terminal device having a memory, a processor, an input interface and an output interface. Here, the memory, the processor, the input interface, and the output interface are connected through a bus system. The memory is used to store the instructions, and the processor executes the instructions stored in the memory to carry out the method of the first aspect or any possible embodiment of the first aspect.

A sixth aspect provides a network device having a memory, a processor, an input interface and an output interface. Here, the memory, the processor, the input interface, and the output interface are connected through a bus system. The memory is used to store the instructions, and the processor executes the instructions stored in the memory to execute the method of the second aspect or any possible embodiment of the second aspect.

A seventh aspect provides a computer storage medium for storing computer software instructions for executing the method of the first aspect or any possible embodiments of the first aspect or the method of the second aspect or any possible embodiments of the second aspect provided that the computer software instructions include a program designed to perform the above aspects.

An eighth aspect provides a computer program product, which, when executed by a computer, causes the computer to: run the method

These or other aspects of the present invention will be more readily understood by the following description of the Examples.

1 is a schematic diagram of an application scene of an embodiment of the present invention.
2 is a flowchart of a random access process.
3 is a block diagram of a method for random access in an embodiment of the present invention;
4 is a schematic diagram of a positional relationship between a preamble and a RAR window in the time domain according to an embodiment of the present invention.
5 is a schematic diagram of a positional relationship between a preamble and an RAR window in another time domain according to an embodiment of the present invention.
6 is a schematic diagram of a positional relationship between a preamble and an RAR window in another time domain according to an embodiment of the present invention.
7 is a schematic diagram of a positional relationship between a preamble and a RAR window in another time domain according to an embodiment of the present invention.
8 is a schematic diagram of a positional relationship between a preamble and an RAR window in another time domain according to an embodiment of the present invention.
9 is another block diagram of a method for random access in an embodiment of the present invention.
10 is a block diagram of a MAC PDU including RAR.
11 is a block diagram of a terminal device according to an embodiment of the present invention.
12 is a block diagram of a network device in an embodiment of the present invention.
13 is another block diagram of a terminal device according to an embodiment of the present invention.
14 is another block diagram of a network device in an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

In addition, the technical solutions of the embodiments of the present invention are various communication systems, for example, Global System of Mobile Communication (GSM), Code Division Multiple Access (CDMA) system, and broadband code division multiple access. (WCDMA: Wideband Code Division Multiple Access) system, universal packet radio service (GPRS: Genera1 Packet Radio Service) system, LTE (Long Term Evolution) system, LTE frequency division duplex (FDD: Frequency Division Duplex) system, LTE time division duplex ( TDD: Time Division Duplex) system, Universal Mobile Telecommunication System (UMTS) or WiMAX (Worldwide Interoperability for Microwave Access) communication system, NR (New Radio Access Technology) or future 5G system, etc. can be

In particular, the technical solution of the embodiment of the present application is applied to a communication system based on various non-orthogonal multiple access technologies, such as a sparse code multiple access (SCMA) system and a low density signature (LDS) system. In addition, the SCMA system and the LDS system may be referred to by different names in the communication field. In addition, the technical solution of the embodiment of the present invention is a multi-carrier transmission system using a non-orthogonal multiple access technique, for example, orthogonal frequency division multiplexing (OFDM) using a non-orthogonal multiple access technique, filter group It can be applied to a multi-carrier (FBMC: Filter Bank Multi-Carrier), a generalized frequency division multiplexing (GFDM), a filtering orthogonal frequency division multiplexing (F-OFDM: Filtered-OFDM) system, and the like.

Embodiments of the present invention include a User Equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or It can point to a user device. The access terminal includes a cellular phone, a wireless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), and a portable device having a wireless communication function. device, computing device or other processing device connected to a wireless modem, automotive device, wearable device, a terminal device in a future 5G network, or a terminal device in a future Public Land Mobile Network (PLMN), etc. It is not limited to the embodiment of the invention.

The network device of the embodiment of the present invention may be a device for communicating with a terminal device, for example, may be a base transceiver station (BTS) in a GSM system or CDMA, and a base station (NodeB, NB) in a WCDMA system. ), may be an evolved base station (eNB or eNodeB: Evolutional Node B) in an LTE system, or may be a Cloud Radio Access Network (CRAN) long-lived radio controller, or the network device is It may be a relay station, an access point, a vehicle device, a wearable device, and a network device in a future 5G network or a network device in a future evolved PLMN network, but embodiments of the present invention are not limited thereto.

1 is a schematic diagram of an application scene according to an embodiment of the present invention. The communication system of FIG. 1 may include a terminal device 10 and a network device 20 . The network device 20 provides a communication service to the terminal device 10 and is for accessing the core network, and the terminal device 10 searches for a synchronization signal, a broadcast signal, etc. transmitted by the network device 20 . to access the network and communicate with the network. The arrows shown in FIG. 1 may indicate uplink/downlink transmission through a cellular link between the terminal device 10 and the network device 20 .

Random access technology is the main content when a user communicates with a network in a mobile communication system. In a wireless cellular network, a user initiates a connection request to the network side through a random access process. The main purpose of random access in the LTE system is to set up synchronization to receive a necessary Cell Radio Network Temporary Identifier (C-RNTI). Accordingly, the random access is applied not only to the initial access, but also when the user's up-synchronization is lost. For ease of understanding, the random access process will be briefly described with reference to FIG. 2 . As shown in Fig. 2, there are mainly the following contents.

1, first, a random access preamble is transmitted. A main object is that a network device can accurately estimate a transmission delay of a terminal device and solve a contention problem in which a plurality of terminal devices initiate access requests at the same time.

2, the feedback information that the network device sends to the terminal, that is, the random access response (RAR), includes the transmission delay required for up-synchronization and the access overload situation of the current system (the terminal device uses a back-off mechanism to avoid contention). for) is included. In addition, the network device feeds back the uplink resource location allocated to the access terminal device to the terminal.

3, the terminal device transmits a message corresponding to the random access event in the designated uplink resource and the terminal device's own terminal device identifier C-RNTI.

4, the network device feeds back contention resolution information to the terminal device; Accordingly, it is possible to completely solve the contention problem caused by a plurality of terminal devices simultaneously accessing the system in the random access process.

Due to the limitation of the access resource, contention occurs when a plurality of terminal devices simultaneously start accessing the same access resource. The terminal device can determine whether this random access has failed depending on whether the feedback information of 2 is received within the random access response time window or whether the preamble included in the received feedback information matches that transmitted by itself have. Specifically, when feedback information is not received within the random access response time window of the terminal device or the received feedback information does not include a preamble matching that transmitted by the terminal device, the terminal device determines that this random access has failed. may be considered, and the terminal device may also determine that contention resolution has failed based on the contention resolution information received in step 4, and may also determine that this random access has failed.

In the study of future wireless communication systems such as 5G, beamforming technology is an important technology for improving coverage and spectral efficiency. Beamforming (BF) is an embodiment of an adaptive array smart antenna and is a digital signal processing technology provided by an antenna array composed of a plurality of array elements. By using the difference in spatial channel characteristics such as the angle of arrival of the useful signal and the interfering signal, an appropriate weighting value is set in the antenna array to spatially separate the useful signal and the interfering signal, to reduce the interference between users, and to reduce the system capacity promote the improvement of

In the random access process, the terminal device may transmit a preamble preamble to the network device using multi-beams to increase the probability of a random access response of the network device to the terminal device. Monitoring of the RAR window is a problem to be solved when the communication system supports transmission of a plurality of preambles.

3 is a flowchart of a method 100 for random access in an embodiment of the present invention. As shown in FIG. 3 , the method 100 includes some or all of the following.

In step S110, the terminal device transmits a plurality of preambles to the network device in one random access process.

In step S120, the corresponding terminal device monitors the random access response RAR of at least one preamble among the plurality of preambles within the at least one random access response RAR window.

Optionally, the following is described.

One, an application scene of an embodiment of the present invention is to transmit a plurality of preambles in one random access process, a terminal device in an LTE system transmits one preamble to a network device in one random access process, and the random access is In case of failure, it is different from the scene in which the terminal device transmits the same preamble to the network device again. That is, the terminal device continuously transmits a plurality of preambles in one random access process, and there is no need to transmit the preamble again in a state where the RAR of the previously transmitted preamble is not monitored.

Second, in the embodiment of the present invention, the plurality of preambles may be preambles having completely different sequences, and may include preambles having the same sequence. The plurality of preambles may be transmitted by different beams or may be transmitted by the same beam, but is not particularly limited herein.

Third, those skilled in the art can understand that after the UE transmits the preamble, the RAR corresponding to the preamble is received by monitoring a Physical Downlink Control Channel (PDCCH) within the RAR window. If the eNodeB response RAR is not received within this RAR time window, this random access procedure is considered to have failed. 4, the terminal device transmits a preamble to the network device in subframe 1, starts monitoring RAR in subframe 4, monitors RAR in subframe 5, or in another subframe within the RAR window The RAR may be monitored, or the RAR may not be monitored within the RAR window. Here, the time domain length of the RAR window may be configured by the parameter ra-Response WindowSize. The relative position between the subframe transmitting the preamble and the RAR window may be stipulated by the protocol.

Fourth, an uplink resource is occupied for the terminal device to transmit the preamble, and a downlink resource is used for the terminal device to monitor the RAR, that is, the resource for the terminal device to transmit the preamble and the resource for the terminal device to monitor the RAR are in the frequency domain. They do not overlap, but overlap in the time domain. That is, in an embodiment of the present invention, the terminal device may transmit the second preamble in subframe 4 as shown in FIG. 4 and monitor the RAR of the second preamble within the RAR window after subframe 4 .

Accordingly, the method for random access according to the embodiment of the present invention is advantageous in that the terminal device transmits a plurality of preambles to the network device in one random access process, thereby improving the reliability of the preamble transmission and the probability of the network device for the preamble response. .

Optionally, in an embodiment of the present invention, the at least one RAR window includes one RAR window whose starting position in the time domain is located after transmission of at least one preamble among the plurality of preambles, and the corresponding terminal device includes at least one In the step of monitoring the random access response RAR of at least one preamble among the plurality of preambles within the random access response RAR window of including the steps of

Specifically, the network device configures one RAR window in advance, and the starting position in the time domain of the RAR window may be located after the terminal device transmits a plurality of preambles, and as shown in FIG. It is assumed that the device configures transmission resources of three preambles and transmits the three preambles in subframe 1, subframe 2, and subframe 3, respectively. If the protocol stipulates that there is a start subframe of the RAR window after the subframe of the last preamble transmitted by the terminal device, the terminal device may monitor the RAR of the three preambles within the RAR window starting from subframe 4. .

It should be understood that the position at which the terminal device transmits the preamble and the length of the RAR window may be preconfigured by the network device or stipulated by the protocol. Here, contracted by the protocol refers to the configuration of shipment of the terminal device.

In addition, although the corresponding RAR window configured by the network device may be for the plurality of preambles, there is a possibility that the terminal device does not monitor the RAR of each preamble among the plurality of preambles within the corresponding RAR window. That is, the terminal device may monitor the RAR of at least one of the plurality of preambles in one RAR window after transmission of the plurality of preambles. For example, the terminal device monitors any combination of the RAR of the preamble transmitted in subframe 1, the RAR of the preamble transmitted in subframe 2, and the RAR of the preamble transmitted in subframe 3 within the RAR window of FIG. can

Optionally, in an embodiment of the present invention, the at least one RAR window is one RAR window whose starting position in the time domain is located after a first preamble transmission of the plurality of preambles and before a second preamble transmission of the plurality of preambles. Including, the step of the terminal device monitoring the random access response RAR of at least one preamble of the plurality of preambles within the at least one random access response RAR window, the terminal device monitoring the RAR of at least two preambles among the preambles of .

Specifically, the network device configures one RAR window in advance, and the start position in the time domain of the RAR window is located after the first preamble transmission and before the second preamble transmission, and as shown in FIG. 6 , the network device is connected to the terminal device. It is assumed that the transmission resources of three preambles are configured, the terminal device transmits three preambles to the network device in one random access process, and the three preambles are transmitted in subframe 1, subframe 3, and subframe 5 and, when it is agreed by the protocol that the start subframe of the RAR window is located after the subframe of the first transmitted preamble by the terminal device and before the subframe of the second transmitted preamble, the terminal device starts from subframe 2 It is possible to monitor the RAR of the three preambles within the RAR window.

Further, the end position of the RAR window in the time domain may be after the position in the time domain of the last preamble transmitted by the terminal device.

In addition, although the corresponding RAR window configured by the network device is for a plurality of preambles, the terminal device does not necessarily monitor each RAR among the plurality of preambles within the RAR window. That is, the terminal device may monitor the RAR of at least one preamble among the plurality of preambles in the RAR window after the transmission of the first preamble is terminated. For example, the terminal device may monitor a combination of the RAR of the preamble transmitted in subframe 1, the RAR of the preamble transmitted in subframe 3, and the RAR transmitted in subframe 5 within the RAR window as shown in FIG. 6 .

Optionally, the network device configures one RAR window for the plurality of preambles, and the starting position in the time domain of the RAR window may be between any two preamble transmissions. Embodiments of the present invention are not limited thereto. For example, as shown in FIG. 7 , the network device configures transmission resources of three preambles for the terminal device, and the terminal device transmits three preambles transmitted in each of subframe 1, subframe 3, and subframe 5 once When transmitting to the network device in random processing, and it is agreed by protocol that the start subframe of the RAR window is located after the preamble subframe that the terminal device transmits the second time, the terminal device starts from subframe 4 as shown in FIG. 7 . A combination of one of the RAR of the preamble transmitted in subframe 1, the RAR of the preamble transmitted in subframe 3, and the RAR transmitted in subframe 5 may be monitored within the RAR window.

Optionally, the terminal device may configure a combination of the two types of RAR windows in a plurality of preambles. For example, as shown in FIG. 8 , the network device configures transmission resources of five preambles in the terminal device, and the terminal device transmits in subframe 1, subframe 2, subframe 3, subframe 5, and subframe 7, respectively. 5 preambles are transmitted to the network device in one random process, and the network device configures one RAR window for the first two preambles, configures another RAR window for the next three preambles, and the first 2 The starting position in the time domain of the RAR window configured for the preambles is subframe 3 (after transmitting the first two preambles), and the starting position in the time domain of the RAR window configured for the following three preambles is subframe 4 (after transmitting 3 preambles, before transmitting 4 preambles). 8 is for illustrative purposes only, and is not intended to limit the scope of the embodiments of the present invention.

Optionally, in an embodiment of the present invention, the at least one RAR window includes a plurality of RAR windows positioned after preamble transmission corresponding to a start position in the time domain of each RAR window corresponding to the plurality of preambles one-to-one. and monitoring, by the terminal device, a random access response RAR of at least one preamble among the plurality of preambles within at least one random access response RAR window, wherein the terminal device performs the RAR corresponding to the preamble within each RAR window. monitoring the

Specifically, the network device may preset one RAR window for each preamble, and the starting position in the time domain of each RAR window is located after the corresponding preamble transmission, and as shown in FIG. 9 , the network device provides three preambles to the terminal device. The transmission resource is set, and the terminal device transmits three preambles to the network device in one random process, and the three preambles are transmitted in each subframe 1, subframe 3 and subframe 5, and correspond to the first preamble The RAR window corresponding to the second preamble starts from subframe 2, the RAR window corresponding to the second preamble starts from subframe 4, and the RAR window corresponding to the third preamble starts from subframe 6, that is, the terminal device starts from subframe 2 Monitoring the RAR of the first preamble within the RAR window starting from, monitoring the RAR of the second preamble within the RAR window starting from subframe 4, and RAR of the third preamble within the RAR window starting from subframe 6 monitor

In addition, the end position of the RAR window in the time domain may be configured after any preamble transmitted by the terminal device.

Optionally, the terminal device may configure a combination of the three types of RAR windows in a plurality of preambles. That is, the terminal device may arrange a dedicated RAR window in some preambles among a plurality of preambles, and may arrange a common RAR window in some preambles, and the starting position of the common RAR window in the time domain is after any preamble transmission. can be located 5 to 8 , repeated description is omitted here for the sake of brevity.

Optionally, in an embodiment of the present invention, the start position of the first RAR window in the time domain in the plurality of RAR windows is located in the K-th subframe after the preamble transmission corresponding to the first RAR window, and K is less than 3 is the integer of

That is, in the above-described manner in which each preamble corresponds to one RAR window, the interval between the start position of each RAR window in the time domain and the transmission position of the corresponding preamble is less than 3 subframes, for example less than 3ms can Here, it should be understood that the subframe length may be understood as 1 ms in LTE, may be other time domain unit lengths, and the embodiment of the present invention is not limited thereto.

By shortening the time interval between the RAR window and the preamble transmission, the terminal device can monitor the corresponding RAR more quickly, which is advantageous for the terminal device to perform random access.

It should be understood that the interval between the start position of the RAR window and the transmission position of the corresponding preamble is less than 3 subframes and is applicable to the various RAR windows described above. Embodiments of the present invention are not limited thereto. For example, the starting position of the RAR window configured in the terminal device by the network device in the method of FIG. 5 may be the first two subframes after the last preamble transmission.

Optionally, in an embodiment of the present invention, the step of transmitting, by the terminal device, a plurality of preambles to the network device in one random access process includes the terminal device performing at least one physical random access channel PRACH resource in one random access process. and transmitting the plurality of preambles to the corresponding network device through

Optionally, in an embodiment of the present invention, the step of the terminal device transmitting the plurality of preambles to the corresponding network device through at least one physical random access channel PRACH resource in the one-time random access process is performed by the terminal device once and transmitting the plurality of preambles to a corresponding network device through a plurality of PRACH resources corresponding to the plurality of preambles one-to-one in a random access process.

A Physical Random Access Channel (PRACH) is used to transmit a random access preamble, and a network device may preconfigure a plurality of PRACH resources to transmit a plurality of preambles, and one to transmit a plurality of preambles can configure the PRACH resource of , the terminal device can determine by itself to use a location in one PRACH resource to transmit the corresponding preamble, and the network device configures a plurality of PRACH resources corresponding to one beam A person skilled in the art understands that the present invention is not limited thereto, although other PRACH resources corresponding to different beams may be configured.

Optionally, in an embodiment of the present invention, after the terminal device monitors the RAR of a first preamble among the plurality of preambles within the at least one RAR window, the method further includes: and transmitting a message about the random access event to the corresponding network device according to the uplink grant included in the RAR.

After monitoring the RAR of one of the preambles, the terminal device may transmit a third message (MSG3) in the random access process to the network device according to the uplink grant included in the RAR. Since the contents of these messages are not fixed in the random access process, different messages are carried according to different scenes. For example, a Radio Resource Control (RRC) connection request is carried, or a control message or a service data packet is carried.

In a future wireless communication system such as 5G, the third message in the random access process may include the following.

1, in the initial RRC connection establishment, when the terminal device switches from the idle state to the connected state, the terminal device starts random access;

2, in the RRC connection re-establishment, when the terminal device needs to re-establish the RRC connection after radio link failure, the UE initiates random access.

3 When the terminal device handovers, the terminal device starts random access in the target cell, and at this time, the terminal device needs to establish up-synchronization with the new cell.

4, in the RRC connection state, downlink data arrives, but the terminal device finds an uplink out-of-sync state (the network device maintains an upstream timer, the upstream timer expires, the network device sends a sounding signal to the terminal device If not received, the network device recognizes that the terminal device is out of uplink synchronization), the network device controls the terminal device to start random access.

5, uplink data has arrived in the RRC connection state, but the terminal device itself is in an uplink out-of-sync state (the network device maintains the upstream timer, the uptime timer expires, the terminal device adjusts the timing advance of the network device) If it does not receive the TA) command, the terminal device recognizes itself as out of uplink synchronization) or a physical uplink control channel (PUCCH) that can be used to transmit a scheduling request (SR). If there are no resources, the terminal device starts random access.

6 Random access initiated when a terminal device transitions from an inactive state to a connected state.

7 The terminal can acquire system information.

Optionally, in an embodiment of the present invention, the RAR of the first preamble is the RAR first monitored by the terminal device within the at least one RAR window.

That is, the terminal device may transmit the third message to the network device according to the uplink grant included in the RAR monitored first. Alternatively, when the terminal device monitors a plurality of RARs within the at least one RAR window, it may select one RAR and transmit a third message to the network device according to an uplink grant included in the selected RAR. . For example, when the terminal device monitors a plurality of RARs, the terminal device transmits a third message to the network device according to the uplink grant included in the first monitored RAR, and the terminal device sends a signal strength among the received plurality of RARs. may transmit a third message to the network device according to the uplink grant included in the strongest RAR of The third message may be transmitted to the network device, but the present invention is not limited thereto.

Optionally, in an embodiment of the present invention, the random access process is a contention-based random access process, a non-contention-based random access process, or a random access process for acquiring system information.

That is, the embodiment of the present invention is not limited to a specific scene of the random access process.

9 is a block diagram of a method 200 for random access in an embodiment of the present invention. As shown in FIG. 9 , the method 200 includes steps S210 and S220.

In step S210, the network device receives a plurality of preambles transmitted by the terminal device in one random access process.

In step S220, the corresponding network device feeds back at least one random access response RAR corresponding to at least one preamble among the plurality of preambles to the corresponding terminal device.

Specifically, the terminal device may transmit a plurality of preambles to the network device in one random process, and similarly, the network device receives the plurality of preambles, and the network device transmits at least one of the plurality of preambles to the terminal device. The RAR of the preamble may be fed back.

Therefore, in the method for random access of the embodiment of the present invention, the network device can receive a plurality of preambles transmitted by the terminal device in one random access process, and the reliability of the preamble transmission and the preamble response from the network device It is advantageous to improve the probability.

Optionally, in an embodiment of the present invention, the step of feeding back, by the corresponding network device, at least one random access response RAR corresponding to at least one preamble among the plurality of preambles to the corresponding terminal device includes: After receiving the first preamble among the preambles, the RAR corresponding to the first preamble is fed back to the corresponding terminal device, and after the corresponding network device receives a preamble other than the corresponding first preamble among the plurality of preambles, the corresponding terminal device and not feedback the RAR to

That is, after the network device receives the first preamble, the RAR of the first preamble is fed back to the terminal device, and after the network device receives another preamble, the RAR is not fed back to the terminal device, that is, the network device Only one RAR is fed back to the terminal device, and the corresponding RAR is the RAR of the first preamble.

Optionally, in an embodiment of the present invention, the at least one RAR includes a plurality of RARs corresponding to the plurality of preambles on a one-to-one basis, and the corresponding network device sends the corresponding terminal device to the at least one preamble of the plurality of preambles. In the step of feeding back the corresponding at least one random access response RAR, whenever the corresponding network device receives one preamble among the plurality of preambles, the RAR corresponding to the corresponding terminal device is fed back.

Specifically, whenever the network device receives one preamble, the RAR corresponding to the terminal device is fed back, that is, the RAR fed back by the network device to the terminal device corresponds to the preamble received by the network device one-to-one.

Optionally, in an embodiment of the present invention, the step of feeding back, by the network device, at least one random access response RAR corresponding to at least one preamble among the plurality of preambles to the corresponding terminal device includes: and feeding back the corresponding at least one RAR to the corresponding terminal device after receiving the preamble.

After receiving all the preambles, the network device may select and feed back at least one preamble among them. For example, the network device configures a transmission resource of 5 preambles in the terminal device, and the network device basically transmits 5 preambles to the network device in one random access process by the terminal device, and the network device transmits 5 preambles After receiving, the network device may select one preamble from among them and feed back, and if the network device receives three preambles and a fourth preamble is not received within a preset time, the network device basically It is considered that the other two preambles are lost, and one preamble can be selected and fed back from three directly received preambles.

The step of the network device feeding back the RAR to the terminal device for the plurality of preambles is exemplary, and the embodiment of the present invention is not limited thereto.

Optionally, in an embodiment of the present invention, after the corresponding network device receives the plurality of preambles, the step of feeding back at least one RAR corresponding to the at least one preamble to the corresponding terminal device includes: and feeding back the corresponding at least one RAR to the corresponding terminal device after receiving the plurality of preambles, according to the strength of a signal having received the plurality of preambles or the reception order of the plurality of preambles.

The network device may feed back the RAR to the terminal device according to the order of the received preambles. For example, the network device may feed back on one or more preambles received first. The network device may feed back the RAR to the terminal device according to the strength of the received preamble signal. For example, the network device may feed back one or more preambles having the strongest signal strength among a plurality of received preambles. In addition, the method of feeding back the RAR for the preamble to the terminal device is merely an example and is not intended to limit the scope of the present invention.

Optionally, in an embodiment of the present invention, the at least one RAR comprises a plurality of RARs carried by one media access control MAC data protocol unit PDU.

RAR is generally carried by a Media Access Control (MAC) Protocol Data Unit (PDU), the structure of the corresponding MAC PDU is as shown in FIG. 10, and the corresponding MAC PDU is more than in FIG. Those skilled in the art understand that it may be composed of one MAC header + zero or more MAC Random Access Response (RAR) + padding that may exist. One MAC RAR among them corresponds to one preamble. Specifically, when the network device feeds back RARs corresponding to a plurality of preambles to the terminal device, each RAR may be carried by a different MAC PDU, and a plurality of RARs may be carried by the same MAC PDU.

In this specification, it should be understood that the terms "system" and "network" are frequently used interchangeably herein. Here, "and / or" is simply one of the relational relations describing the related object, and indicates that there may be three relations. For example, A and/or B means three cases: only A exists, A and B exist simultaneously, and only B exists. The "/" character in this manual generally indicates that the related object before and after is a kind of 'or' relationship.

It should be understood that the characteristics, functions, etc. related to the interaction between the network device and the terminal device described by the network device correspond to the related characteristics, functions, etc. of the terminal device. In addition, since the related content is described in detail in the method 100, the description is omitted here for the sake of brevity.

In addition, in various embodiments of the present invention, the size of the number of each process does not mean before and after the execution order, and the execution order of each process should be determined by a function and internal logic, and the implementation of the embodiment of the present invention It should be understood that no restrictions shall be constituted with respect to the process.

The random access method according to the embodiment of the present invention has been described in detail above, and the random access device according to the embodiment of the present invention will be described below with reference to FIGS. 11 to 14, and technical features described in the method embodiment is applicable to the following device embodiments.

11 is a block diagram of a terminal device 300 according to an embodiment of the present invention. 11 , the corresponding terminal device 300 includes a first transmitting unit 310 and a monitoring unit 320 .

The first transmitting unit 310 is configured to transmit a plurality of preambles to the network device in one random access process.

The monitoring unit 320 is configured to monitor the random access response RAR of at least one of the plurality of preambles within the at least one random access response RAR window.

Accordingly, the terminal device according to the embodiment of the present invention transmits a plurality of preambles to the network device in one random access process, thereby improving the reliability of the preamble transmission and the probability of the network device responding to the preamble.

Optionally, in an embodiment of the present invention, the at least one RAR window includes one RAR window whose starting position in the time domain is located after transmission of the plurality of preambles, and the corresponding monitoring unit is configured within the one RAR window. and monitor the RAR of at least two preambles among the plurality of preambles.

Optionally, in an embodiment of the present invention, the at least one RAR window is one RAR window in which the start position of the time domain is located after the first preamble transmission of the plurality of preambles and before the second preamble transmission of the plurality of preambles. and the corresponding monitoring unit is configured to monitor the RAR of at least two preambles among the plurality of preambles within the corresponding one RAR window.

Optionally, in an embodiment of the present invention, the at least one RAR window includes a plurality of RAR windows positioned after transmission of a preamble corresponding to a start position in the time domain of each RAR window corresponding to the plurality of preambles one-to-one. do,

The corresponding monitoring unit is configured to monitor the RAR corresponding to the corresponding preamble within the respective RAR window.

Optionally, in an embodiment of the present invention, the start position in the time domain of the first RAR window in the at least one RAR window is located in the K-th subframe after the preamble transmission corresponding to the first RAR window, and K is 3 is an integer less than

Optionally, in an embodiment of the present invention, the first transmitting unit is configured to transmit the plurality of preambles to the corresponding network device through at least one physical random access channel PRACH resource in one random access process.

Optionally, in an embodiment of the present invention, the first transmitting unit is configured to transmit the plurality of preambles to the corresponding network device through a plurality of PRACH resources corresponding to the plurality of preambles one-to-one in one random access process. .

Optionally, in an embodiment of the present invention, the terminal device includes a second transmitting unit, wherein the second transmitting unit is configured such that the monitoring unit detects the RAR of the first preamble among the plurality of preambles within the corresponding at least one RAR window. After monitoring, it is configured to transmit a message about the random access event to the corresponding network device according to the uplink grant included in the RAR of the first preamble.

Optionally, in an embodiment of the present invention, the RAR of the first preamble is the RAR initially monitored by the corresponding terminal device within the at least one RAR window.

Optionally, in an embodiment of the present invention, the random access process is a contention-based random access process, a non-contention-based random access process, or a random access process for acquiring system information.

In addition, the terminal device 300 according to the embodiment of the present invention may correspond to the terminal device according to the embodiment of the present invention, and the above-described and other operations and/or functions of each unit of the terminal device 300 are illustrated in FIG. It is for realizing the flows corresponding to the terminal devices of the methods shown in Figs. 3 to 9, respectively, and for the sake of brevity, repeated explanations are omitted here.

12 is a block diagram of a network device 400 of an embodiment of the present invention. As shown in FIG. 12 , the corresponding network device 400 includes a receiving unit 410 and a transmitting unit 420 .

The receiving unit 410 is configured to receive the plurality of preambles transmitted by the terminal device in one random access process.

The transmitting unit 420 is configured to feed back at least one random access response RAR corresponding to at least one of the plurality of preambles to the corresponding terminal device.

Accordingly, the network device according to the embodiment of the present invention receives a plurality of preambles transmitted by the terminal device in one random access process, which is advantageous in improving the reliability of preamble transmission and the probability of the network device responding to the preamble.

Optionally, in an embodiment of the present invention, after receiving the first preamble among the plurality of preambles, the transmitting unit feeds back the RAR corresponding to the first preamble to the terminal device, and the first of the plurality of preambles After receiving a preamble other than the th preamble, the RAR is not fed back to the corresponding terminal device.

Optionally, in an embodiment of the present invention, the at least one RAR includes a plurality of RARs corresponding to the plurality of preambles on a one-to-one basis, and each time the corresponding transmitting unit receives one preamble of the plurality of preambles, and feed back the RAR corresponding to the corresponding terminal device.

Optionally, in an embodiment of the present invention, the transmitting unit is configured to feed back the corresponding at least one RAR to the corresponding terminal device after the corresponding network device receives the plurality of preambles.

Optionally, in an embodiment of the present invention, after receiving the plurality of preambles, the receiving unit corresponds to the corresponding terminal device according to the strength of a signal for receiving the plurality of preambles or the reception order of the plurality of preambles. is configured to feedback the RAR of

Optionally, in an embodiment of the present invention, the at least one RAR includes a plurality of RARs, and the plurality of RARs are carried by one media access control MAC data protocol unit PDU.

Optionally, in an embodiment of the present invention, the receiving unit 410 is configured to receive the plurality of preambles transmitted by the corresponding terminal device via at least one physical random access channel PRACH resource in one random access process .

Optionally, in an embodiment of the present invention, the receiving unit 410 receives the plurality of preambles transmitted by the corresponding terminal device through a plurality of PRACH resources corresponding to the plurality of preambles one-to-one in one random access process configured to receive

Optionally, in an embodiment of the present invention, the random access process is a contention-based random access process, a non-contention-based random access process, or a random access process for acquiring system information.

The network device 400 according to the embodiment of the present invention may correspond to the network device according to the embodiment of the method of the present invention, and the above-described and other operations and/or functions of each unit of the network device 400 are respectively It is for implementing the flow corresponding to the network device of the method of FIG. 10, and for the sake of brevity, repeated description is omitted here.

As shown in FIG. 13 , the embodiment of the present invention further provides a terminal device 500 , the terminal device 500 may be the terminal device 300 of FIG. 11 , and the method ( 100) is used to execute the contents of the terminal device corresponding to FIG. The terminal device 500 includes an input interface 510 , an output interface 520 , a processor 530 and a memory 540 , and an input interface 510 , an output interface 520 , a processor 530 and a memory. 540 may be connected by a bus system. Memory 540 is used to store programs, instructions or code. The processor 530 executes a program, command, or code in the memory 540 to receive a signal for controlling the input interface 510 , and control the output interface 520 to send a signal, the operation of the embodiment of the method to complete

Accordingly, the terminal device according to the embodiment of the present invention transmits a plurality of preambles to the network device in one random access process, thereby improving the reliability of preamble transmission and the probability of the network device responding to the preamble.

In addition, in the embodiment of the present application, the processor 530 includes a central processing unit (CPU), other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), It can be other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor, any general processor, or the like.

Memory 540 may include read-only memory and random access memory, and provides instructions and data to processor 530 . The memory 540 may further include a non-volatile random access memory. For example, the memory 540 may further include information on the type of storage device.

In the realization process, each step of the method may be realized by an integrated logic circuit of hardware of the processor 530 or an instruction in a software aspect. The steps of the method disclosed in the embodiments of the present application may be executed by a hardware processor, and may be executed by a combination of a hardware and software module group of the processor. A software module may reside in a storage medium such as random memory, flash memory, read-only memory, programmable read-only memory or electronic erasable programmable memory, registers, and the like. The corresponding storage medium resides in the memory 540 , and the processor 530 reads information in the memory 540 , and may execute the steps of the method in the hardware. In order to avoid duplication, the description is omitted here.

In a specific embodiment, the first transmitting unit and the second transmitting unit of the terminal device 300 may be realized by the output interface 520 of FIG. 13 , and the monitoring unit of the terminal device 300 is the input interface of FIG. 13 . 510 may be realized.

14 , the embodiment of the present invention further provides a network device 600 , the network device 600 may be the network device 400 of FIG. 5 , and corresponds to the method 200 of FIG. 10 . It is used to execute the contents of the network device. The network device 600 includes an input interface 610 , an output interface 620 , a processor 630 and a memory 640 , and an input interface 610 , an output interface 620 , a processor 630 and a memory. 640 may be connected by a bus system. The corresponding memory 640 is used to store programs, instructions, or codes. The processor 630 executes a program, command or code in the memory 640 to receive a signal to control the input interface 610 , control the output interface 620 to transmit a signal, and complete the operation of the embodiment of the method do.

Accordingly, the network device of the embodiment of the present invention receives a plurality of preambles transmitted by the terminal device in one random access process, which is advantageous in improving the reliability of preamble transmission and the probability of the network device responding to the preamble.

In an embodiment of the present invention, the processor 630 may be a central processing unit (CPU), and may be another general-purpose processor, a digital signal processor (DSP), or an application specific integrated circuit (Application Specific Integrated Circuit). ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or the like. A general-purpose processor may be a microprocessor, the processor may be any conventional processor, or the like.

The corresponding memory 640 may include a read-only memory and a random access memory, and may provide instructions and data to the processor 630 . A portion of the memory 640 may further include a non-volatile random access memory. For example, the memory 640 may further store device type information.

In the implementation process, each content of the method may be achieved by an integrated logic circuit of hardware in the processor 630 or an instruction in the form of software. The content of the method disclosed in relation to the embodiment of the present invention may be directly implemented by a hardware processor, or may be executed by a combination of hardware and software modules of the processor. The software module may be located in a storage medium skilled in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers, and the like. The corresponding storage medium is located in the memory 640 , and the processor 630 reads information from the memory 640 and completes the contents of the method described above together with the hardware. In order to avoid duplication, detailed descriptions are omitted herein.

In a specific embodiment, the transmitting unit of the network device 400 may be realized by the output interface 620 of FIG. 14 , and the first receiving unit and the second receiving unit of the network device 400 are the input interface of FIG. 14 . (610) can be realized by .

It can be understood by those skilled in the art that each exemplary unit and algorithm step described in the embodiments disclosed in the present application can be realized using electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in the form of hardware or software is determined by the specific application of the technical solution and design constraints. Skilled artisans may implement the described functions using different methods for each particular application, but such implementation should not be regarded as a departure from the scope of the present invention.

It should be understood by those skilled in the art that, for convenience and conciseness of description, the operation process of the system, apparatus and unit may refer to the corresponding process of the embodiment of the method, and the description is omitted herein.

It should be understood that the systems, apparatuses, and methods disclosed in some embodiments provided in this application may be implemented in other ways. For example, the above-mentioned device embodiment is merely exemplary, for example, the division of the unit is a simple logical function division, and there may be other division methods when practically realized, for example, A plurality of units or components may be combined or integrated into another system, or some technical features may be omitted or not implemented. Also, the coupling or direct coupling, or communication connection between each component part specified or under consideration may be connected by indirect coupling or communication of some interface, device or unit, and may be in an electrical, mechanical or other form.

The unit described as a separate component above may be physically separated or may not be physically separated. A component represented by a unit may be a physical unit, may not be a physical unit, that is, may be located in one place, or may be distributed in a plurality of network units. According to actual demand, some or all of the units may be selected to achieve the objective of the technical solution of this embodiment.

In addition, in each embodiment of the present invention, each functional unit may be integrated into one processing unit, each unit may be an independent unit, or two or more units may be integrated into one unit.

When the above functions are realized in the manner of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Therefore, the technical solution of the present invention is in fact, in other words, a part contributing to the prior art or a part of the technical solution can be implemented in the form of a software product, the computer software product being stored in a storage medium, and a computer device (PC, It may be a server or a network device, etc.) and includes a plurality of instructions for executing the method of all or part of each embodiment of the present application. The storage medium is a medium capable of storing various program codes, such as a USB memory, a removable storage medium, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or a compact disk. includes

What has been described above is merely specific embodiments of the present invention, the present invention is not limited thereto, and modifications or replacements that can be easily conceived by those skilled in the art within the scope disclosed in the present invention are all within the scope of the present invention. should be included in Accordingly, the scope of the present invention should be governed by the described claims.

Claims (20)

transmitting, by the terminal device, a plurality of preambles to the network device in one random access process; and
monitoring, by the terminal device, a random access response of at least one preamble of the plurality of preambles within at least one random access response (RAR) window;
The plurality of preambles are preambles having completely different sequences, and the at least one random access response window is located after transmission of a preamble corresponding to a start position in the time domain of each random access response window corresponding to the plurality of preambles one-to-one. comprising a plurality of random access response windows;
monitoring, by the terminal device, a random access response of at least one preamble among the plurality of preambles within at least one random access response window,
monitoring, by the terminal device, a random access response corresponding to a preamble within each random access response window;
The start position in the time domain of the first random access response window in the plurality of random access response windows is located in the next subframe after the preamble transmission corresponding to the first random access response window
A method for random access, characterized in that. delete delete delete delete The method of claim 1,
The step of the terminal device transmitting a plurality of preambles to the network device in one random access process comprises:
Transmitting, by the terminal device, the plurality of preambles to the network device through at least one Physical Random Access Channel (PRACH) resource in one random access process
A method for random access, characterized in that. 7. The method of claim 6,
Transmitting, by the terminal device, the plurality of preambles to the network device through at least one physical random access channel resource in one random access process
Transmitting, by the terminal device, the plurality of preambles to the network device through a plurality of physical random access channel resources corresponding to the plurality of preambles one-to-one in one random access process
A method for random access, characterized in that. The method of claim 1,
After the terminal device monitors a random access response of a first preamble of the plurality of preambles within the at least one random access response window, the method further comprises:
transmitting, by the terminal device, a third message in a random access process to the network device according to an uplink grant included in the random access response of the first preamble
A method for random access, characterized in that. 9. The method of claim 8,
The random access response of the first preamble is a random access response initially monitored by the terminal device within the at least one random access response window
A method for random access, characterized in that. 10. The method according to any one of claims 1 and 6 to 9,
The random access process is a contention-based random access process, a non-contention-based random access process, or a random access process for acquiring system information.
A method for random access, characterized in that. a first transmitting unit, configured to transmit a plurality of preambles to the network device in one random access procedure; and
a monitoring unit, configured to monitor a random access response of at least one preamble of the plurality of preambles within at least one Random Access Response (RAR) window;
The plurality of preambles are preambles having completely different sequences, and the at least one random access response window is located after transmission of a preamble corresponding to a start position in the time domain of each random access response window corresponding to the plurality of preambles one-to-one. comprising a plurality of random access response windows;
The monitoring unit is
and monitor a random access response corresponding to a preamble within each random access response window;
The start position in the time domain of the first random access response window in the plurality of random access response windows is located in the next subframe after the preamble transmission corresponding to the first random access response window
A terminal device, characterized in that. delete delete delete delete delete delete delete delete delete

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